Permission error at the time of creating search application

When trying to create search service app in Sp2013 getting this permission error

System.Data.SqlClient.SqlException (0x80131904): User does not have permission to perform this action. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.Office.Server.Data.SqlSession.ExecuteNonQuery(SqlCommand command) at Microsoft.Office.Server.Data.SqlDatabaseManager.GrantAccess(String user) at Microsoft.Office.Server.Search.Administration.SearchDatabase.GrantAccess(String username, String role) at Microsoft.Office.Server.Search.Administration.SearchDatabase.SynchronizeAccessRules(SearchServiceApplication searchApp) at Microsoft.Office.Server.Search.Administration.SearchServiceApplication.SynchronizeDatabases() at Microsoft.Office.Server.Search.Administration.SearchServiceApplication.Provision() at Microsoft.Office.Server.Search.Administration.SearchAdminUtils.UpdateIgnoreSPUpdatedConcurrencyException(String description, SearchAdminUtilsUpdateDelegate updateDelegate, SearchAdminUtilsRefreshObjectDelegate refreshObjectDelegate) at Microsoft.Office.Server.Search.Administration.SearchConfigWizard.CreateSearchApp() at Microsoft.Office.Server.Search.Administration.SearchConfigWizard.ProvisionSearchServiceApplication() at Microsoft.Office.Server.Search.Administration.SearchConfigurationJobDefinition.ExecuteTimerJob() ClientConnectionId:ca3ab460-7ca5-4493-961e-cdad7ed13465